install localisation library

src/components/ChangeLanguageButton.tsx

@@ -0,0 +1,14 @@
+import React from "react";
+import i18nNext, { useTranslation } from "../i18n";
+
+const ChangeLanguageButton: React.FC = () => {
+  const { t } = useTranslation();
+
+  const { i18n } = i18nNext;
+
+  return (
+    <button type="button" onClick={() => i18n.changeLanguage(i18n.language === "fi" ? "en" : "fi")}>{t("lngButton")}</button>
+  );
+};
+
+export default ChangeLanguageButton;